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99 lines
2.3 KiB
99 lines
2.3 KiB
#define LTC_SOURCE
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*/
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#include "tomcrypt.h"
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/**
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@file f9_file.c
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f9 support, process a file, Tom St Denis
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*/
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#ifdef LTC_F9_MODE
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/**
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f9 a file
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@param cipher The index of the cipher desired
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@param key The secret key
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@param keylen The length of the secret key (octets)
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@param fname The name of the file you wish to f9
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@param out [out] Where the authentication tag is to be stored
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@param outlen [in/out] The max size and resulting size of the authentication tag
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@return CRYPT_OK if successful, CRYPT_NOP if file support has been disabled
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*/
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int f9_file(int cipher,
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const unsigned char *key, unsigned long keylen,
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const char *fname,
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unsigned char *out, unsigned long *outlen)
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{
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#ifdef LTC_NO_FILE
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LTC_UNUSED_PARAM(cipher);
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LTC_UNUSED_PARAM(key);
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LTC_UNUSED_PARAM(keylen);
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LTC_UNUSED_PARAM(fname);
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LTC_UNUSED_PARAM(out);
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LTC_UNUSED_PARAM(outlen);
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return CRYPT_NOP;
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#else
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size_t x;
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int err;
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f9_state f9;
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FILE *in;
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unsigned char *buf;
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LTC_ARGCHK(key != NULL);
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LTC_ARGCHK(fname != NULL);
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LTC_ARGCHK(out != NULL);
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LTC_ARGCHK(outlen != NULL);
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if ((buf = XMALLOC(LTC_FILE_READ_BUFSIZE)) == NULL) {
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return CRYPT_MEM;
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}
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if ((err = f9_init(&f9, cipher, key, keylen)) != CRYPT_OK) {
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goto LBL_ERR;
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}
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in = fopen(fname, "rb");
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if (in == NULL) {
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err = CRYPT_FILE_NOTFOUND;
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goto LBL_ERR;
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}
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do {
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x = fread(buf, 1, LTC_FILE_READ_BUFSIZE, in);
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if ((err = f9_process(&f9, buf, (unsigned long)x)) != CRYPT_OK) {
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fclose(in);
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goto LBL_CLEANBUF;
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}
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} while (x == LTC_FILE_READ_BUFSIZE);
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if (fclose(in) != 0) {
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err = CRYPT_ERROR;
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goto LBL_CLEANBUF;
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}
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err = f9_done(&f9, out, outlen);
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LBL_CLEANBUF:
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zeromem(buf, LTC_FILE_READ_BUFSIZE);
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LBL_ERR:
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#ifdef LTC_CLEAN_STACK
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zeromem(&f9, sizeof(f9_state));
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#endif
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XFREE(buf);
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return err;
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#endif
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}
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#endif
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/* ref: $Format:%D$ */
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/* git commit: $Format:%H$ */
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/* commit time: $Format:%ai$ */
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